What is the total number of valence electrons in a calcium atom in the ground state?

(1) 8 (3) 18

(2) 2 (4) 20

Which type of reaction is FeS+2 HCI--> FeCI2 + H2S?

When you eat an apple, the process of digestion involves - a. physical change only. b. chemical change only. c. physical and chemical change. d. phase change.

A new element is discovered that is very unstable and highly reactive, and it likes to lose its one valence electron. in what group should this element be placed in? explain.

Which statement is true about Hf and HF? (1) both are elements (2) both are compounds (3) both are substances (4) Hf is a compound while HF is an element

What two solutions when mixed together equally have a temperature of 50'C

Read the two questions. Question 1: Should acid precipitation be a concern for the new age environmentalist? Question 2: Does acid precipitation in forests affect the reproduction rate in birds?

How is excitation in spectroscopy brought about

What is the best reason for a student to remove a dangling bracelet when heating test tubes of acidic solutions in a hot-water bath in a chemistry lab?

What does the electron cloud model describe A. Rapidly moving neutrons B. Rapidly moving protons C. A standing wave of electron wavicles surrounding the nucleus D. Rapidly moving nucleus

35mL of acid with an unknown concentration is titrated to completion using 63mL of 3.0 MNaOH. What is the concentration of the acid?